In our first release CoinFLEX 2.0, we will be using USD as the margining currency for Linear accounts. As we are a crypto-only exchange, the USD actually is fungible in USD Coin (USDC) You can learn more about USDC tutaj.
With the maturity and continued growth of the stablecoin business, we hope to be integrating more USD stablecoins in the future, which will also be fungible with the the USD in our systems.
In our earlier version of the exchange, we had quoted USDT (Tether) pairs. USDT can be fungible with USD in our new version. besides, we have launched Tether derivative and spot products, given USDT’s position in the crypto landscape.